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Enhanced stability of SrRuO3 mixed oxide via monovalent doping in Sr1-xKxRuO3 for the oxygen evolution reaction

DOI: 10.1016/j.jpowsour.2021.230950 DOI Help

Authors: Isabel Rodríguez-García (Instituto de Catálisis y Petroleoquímica, CSIC) , Dmitry Galyamin (Instituto de Catálisis y Petroleoquímica, CSIC) , Laura Pascual (Instituto de Catálisis y Petroleoquímica, CSIC) , Pilar Ferrer (Diamond Light Source) , Miguel A. Peña (Instituto de Catálisis y Petroleoquímica, CSIC) , David Grinter (Diamond Light Source) , Georg Held (Diamond Light Source) , Mohamed Abdel Salam (King Abdulaziz University) , Mohamed Mokhtar (King Abdulaziz University) , Katabathini Narasimharao (King Abdulaziz University) , Maria Retuerto (Instituto de Catálisis y Petroleoquímica, CSIC) , Sergio Rojas (Instituto de Catálisis y Petroleoquímica, CSIC)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Power Sources , VOL 521

State: Published (Approved)
Published: February 2022
Diamond Proposal Number(s): 28150

Open Access Open Access

Abstract: Ru mixed oxides are the most active catalysts for the oxygen evolution reaction (OER) in acid electrolyte. However, their stability is seriously compromised during the reaction. In this work we show that it is possible to enhance both OER activity and durability of SrRuO3 mixed oxide by the partial doping with K+ in Sr2+ sites. Sr1-xKxRuO3 perovskites (x = 0.00, 0.05, 0.10 and 0.20) have been synthesized by wet chemistry. The partial doping with K+ cations led to oxides with Ru atoms in a higher oxidation state. In addition, K-doping resulted in perovskites with slightly higher symmetry. The performance of the K-doped perovskites for the OER was assessed in acid electrolyte. Clearly, the K-doped materials, especially Sr0.80K0.20RuO3, display higher activity (lower E10) and significantly higher durability than the undoped sample SrRuO3. The results indicate that chemical modifications on Ru perovskites can be a suitable strategy to improve the stability of Ru phases during the OER.

Journal Keywords: Green hydrogen; Electrolysis; OER; Ru; Perovskite

Subject Areas: Materials, Chemistry, Environment

Instruments: B07-B-Versatile Soft X-ray beamline: High Throughput

Added On: 10/01/2022 09:17

Discipline Tags:

Earth Sciences & Environment Climate Change Physical Chemistry Catalysis Chemistry Materials Science Perovskites Metallurgy

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) Near Edge X-ray Absorption Fine Structures (NEXAFS)